Steel racking with mass 100 lb and surface area 50 ft2 is used to carry products into a batch drying oven at 500 F. The combustion efficiency of the oven is 70%. The specific heat of steel is 0.12 Btu/lb-F, and the convection coefficient is 2 Btu/hr-ft2-F. If the racking enters the oven at room temperature of 70 F and the drying process takes 0.25 hours, calculate the exit temperature of the racking, and the heat and fuel energy loss to the racking with each drying cycle.
Steel racking with mass 100 lb and surface area 50 ft2 is used to carry products into a batch dry...
a. Calculate the dry air and water vapor mass flow rates (lb/min) if the volume flow rate is 1,000 cfm, the humidity ratio is 0.025 lbv/lba, and the dry air density is 0.072 Iba/ft3. b. Assume the above air enters an evaporator coil at 90°F where it is cooled in a constant humidity ratio process until reaching the 100 % RH curve ( the temperature at that point is the dew point. The air then keeps dropping in temperature, following...